Fix reading shared memory for Tuple and Dict spaces

[pseudo-rnd-thoughts]

Description

Soooo shared memory with Tuple or Dict spaces has been broken since the original implementation (5 years old).
We didn't catch this as the expected tests should be assert data_equivalence(read_samples, samples) and were actually just data_equivalence(...). (yes I have checked and can't find anymore instances of this bug in testing)

As a result, the returned samples were roundtripped are

space = Tuple((Discrete(3), Discrete(4)))

num = 2
samples = (space.sample() for _ in range(num))  # ((2, 0), (2, 3))
shared_memory = create_shared_memory(space, n=num, ctx=mp)

for i, sample in enumerate(samples):
    write_to_shared_memory(space, i, sample, shared_memory)

read_samples = read_from_shared_memory(space, shared_memory, n=num)  # ((2, 2), (0, 3))

This PR fixes the bug

[pseudo-rnd-thoughts]

Ironically, the original implementation was correct
The problem was the test was incorrect for these particular cases, we should have been using iterate(read_samples) rather than just iterate like normal.
This PR is reverted in #1165